Question

45.Two rays polarised at right angles to each other are propagating in a medium. They will: (a) Always interfere
(b) interfere under special circumstances (c) do not interfere under any condition
(d) None of these​

Answer 1

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Answer 2

Polarised Rays

Explanation:

• There is no limit to how many electromagnetic waves can be superimposed on each other. At each location, the electric and magnetic fields simply add together.
• When two waves of the same frequency are joined, their superposition causes a persistent interference pattern. Interference can be constructive, in which case the strength grows, or destructive, in which case the strength decreases.
• The quantity of interference at a given place is determined by the phase difference. For phase differences of 0-1200 and 240-3600, constructive interference can be demonstrated.
• As a result, harmful interference develops between 120 and 2400. No phase shift results in total constructive interference, when the strength is at its highest, for two identical waves, and 1800 phase shift results in total destructive interference, where the strength is at its lowest (no signal at all).
• Remember that the idealised plane wave has an indefinite length. When a wave passes through an aperture, it diffracts, or spreads out, from the opening.
• The size of the aperture in relation to the wavelength determines how far the cropped wave spreads out.
• The wave will see no effect and will not diffract at all if the aperture is very large in comparison to the wavelength.